<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="jquery\jquery.js"></script>
    <style>
        #one{
            background-color: pink;width: 500px;height: 500px;
        }
        #two{
            background-color: rgb(201, 192, 255);width: 400px;height: 400px;
        }
        #three{
            background-color: rgb(192, 255, 203);width: 300px;height: 300px;
        }

    </style>
</head>
<body>
<div id="one">
    <div id="two">
        <div id="three">

        </div>
    </div>
</div>
<script>
    $("#one").click(function(){
        alert("one");
    })
    $("#two").click(function(){
        alert("two");
    })
    $("#three").click(function(){
        alert("three");
        // event.stopImmediatePropagation();//阻止冒泡
        // return false;//阻止冒泡与默认行为**对外边两层不管用*
        event.preventDefault();//阻止默认行为
        
    })
</script>
</body>
</html>